
theorem Th3:
  for F being Field, a,b being Element of NonZero F holds revf(F).(
  omf(F).(a,b)) = omf(F).(revf(F).a,revf(F).b)
proof
  let F be Field;
  let a,b be Element of NonZero F;
  reconsider revfa = revf(F).a, revfb = revf(F).b as Element of NonZero F;
  thus revf(F).(omf(F).(a,b)) = revf(F).(omf(F).(a,revf(F).(revf(F).b))) by
REALSET2:23
    .= revfb*revfa by Th2
    .= revfa*revfb
    .= omf(F).(revf(F).a,revf(F).b);
end;
